Android 應用檢查更新並下載

1.在Android應用當中都有應用檢查更新的要求，每每都是在打開應用的時候去更新下載。

實現的方法是：服務器端提供接口，接口中能夠包含在最新APK下載的URL，最新APK的VersionCode，等附帶信息。

將最新APK的Versioncode與當前的APP的VersionCode作大小比較就能夠知道是不是最新版本，若是是最新版本就下載安裝。

2.效果圖：

4.上代碼：

借用別人的接口：http://jcodecraeer.com/update.php

AppVersion：是版本信息的模型類，基本上和服務端返回的東西是相對應的。

DownloadService：是下載模塊。

UpdateChecker：是檢查更新，調用下載模塊，下載完安裝的工具類。

PS：注意Service在Manifest.xml中要申明。

AppVersion：

按 Ctrl+C 複製代碼

public class AppVersion {

private String updateMessage;
private String apkUrl;
private int apkCode;
public static final String APK_DOWNLOAD_URL = "url";
public static final String APK_UPDATE_CONTENT = "updateMessage";
public static final String APK_VERSION_CODE = "versionCode";

public String getUpdateMessage() {
    return updateMessage;
}

public void setUpdateMessage(String updateMessage) {
    this.updateMessage = updateMessage;
}

public String getApkUrl() {
    return apkUrl;
}

public void setApkUrl(String apkUrl) {
    this.apkUrl = apkUrl;
}

public int getApkCode() {
    return apkCode;
}

public void setApkCode(int apkCode) {
    this.apkCode = apkCode;
}

} 按 Ctrl+C 複製代碼

DownloadService：

按 Ctrl+C 複製代碼

public class DownloadService extends IntentService {

public static final int UPDATE_PROGRESS = 8344;

public DownloadService() {
    super("DownloadService");
}

@Override
protected void onHandleIntent(Intent intent) {
    String urlToDownload = intent.getStringExtra("url");
    System.out.println("URLtOdOWNLOAD-->>" +urlToDownload);
    String fileDestination = intent.getStringExtra("dest");
    ResultReceiver receiver = (ResultReceiver) intent
            .getParcelableExtra("receiver");
    try {
        URL url = new URL(urlToDownload);
        URLConnection connection = url.openConnection();
        connection.connect();
        // this will be useful so that you can show a typical 0-100%
        // progress bar
        int fileLength = connection.getContentLength();
        // download the file
        InputStream input = new BufferedInputStream(
                connection.getInputStream());
        OutputStream output = new FileOutputStream(fileDestination);
        byte data[] = new byte[100];
        long total = 0;
        int count;
        while ((count = input.read(data)) != -1) {
            total += count;
            // publishing the progress....
            Bundle resultData = new Bundle();
            resultData.putInt("progress", (int) (total * 100 / fileLength));
            receiver.send(UPDATE_PROGRESS, resultData);
            output.write(data, 0, count);
        }
        output.flush();
        output.close();
        input.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    Bundle resultData = new Bundle();
    resultData.putInt("progress", 100);
    receiver.send(UPDATE_PROGRESS, resultData);
}

} 按 Ctrl+C 複製代碼

UpdateChecker：

按 Ctrl+C 複製代碼

public class UpdateChecker { private static final String TAG = "UpdateChecker"; private Context mContext; // 檢查版本信息的線程 private Thread mThread; // 版本對比地址 private String mCheckUrl; private AppVersion mAppVersion; // 下載apk的對話框 private ProgressDialog mProgressDialog;

private File apkFile;

public void setCheckUrl(String url) {
    mCheckUrl = url;
}

public UpdateChecker(Context context) {
    mContext = context;
    // instantiate it within the onCreate method
    mProgressDialog = new ProgressDialog(context);
    mProgressDialog.setMessage("正在下載");
    mProgressDialog.setIndeterminate(false);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
    mProgressDialog.setCancelable(true);
    mProgressDialog
            .setOnCancelListener(new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {

                }
            });
    mProgressDialog
            .setOnDismissListener(new DialogInterface.OnDismissListener() {
                @Override
                public void onDismiss(DialogInterface dialog) {
                    // TODO Auto-generated method stub

                }
            });
}

public void checkForUpdates() {
    if (mCheckUrl == null) {
        // throw new Exception("checkUrl can not be null");
        return;
    }
    final Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            if (msg.what == 1) {
                mAppVersion = (AppVersion) msg.obj;
                try {
                    int versionCode = mContext.getPackageManager()
                            .getPackageInfo(mContext.getPackageName(), 0).versionCode;
                    System.out.println("version-->" + versionCode
                            + "  mAppVersion.getApkCode()-->>"
                            + mAppVersion.getApkCode());
                    if (mAppVersion.getApkCode() > versionCode) {
                        showUpdateDialog();
                    } else {
                        Toast.makeText(mContext, "已是最新版本",
                                Toast.LENGTH_SHORT).show();
                    }
                } catch (PackageManager.NameNotFoundException ignored) {
                    //
                }
            }
        }
    };

    mThread = new Thread() {
        @Override
        public void run() {
            // if (isNetworkAvailable(mContext)) {
            Message msg = new Message();
            String json = sendPost();
            Log.i("jianghejie", "json = " + json);
            if (json != null) {
                AppVersion appVersion = parseJson(json);
                msg.what = 1;
                msg.obj = appVersion;
                handler.sendMessage(msg);
            } else {
                Log.e(TAG, "can't get app update json");
            }
        }
    };
    mThread.start();
}

protected String sendPost() {
    HttpURLConnection uRLConnection = null;
    InputStream is = null;
    BufferedReader buffer = null;
    String result = null;
    try {
        URL url = new URL(mCheckUrl);
        uRLConnection = (HttpURLConnection) url.openConnection();
        uRLConnection.setDoInput(true);
        uRLConnection.setDoOutput(true);
        uRLConnection.setRequestMethod("POST");
        uRLConnection.setUseCaches(false);
        uRLConnection.setConnectTimeout(10 * 1000);
        uRLConnection.setReadTimeout(10 * 1000);
        uRLConnection.setInstanceFollowRedirects(false);
        uRLConnection.setRequestProperty("Connection", "Keep-Alive");
        uRLConnection.setRequestProperty("Charset", "UTF-8");
        uRLConnection
                .setRequestProperty("Accept-Encoding", "gzip, deflate");
        uRLConnection
                .setRequestProperty("Content-Type", "application/json");
        uRLConnection.connect();
        is = uRLConnection.getInputStream();
        String content_encode = uRLConnection.getContentEncoding();
        if (null != content_encode && !"".equals(content_encode)
                && content_encode.equals("gzip")) {
            is = new GZIPInputStream(is);
        }
        buffer = new BufferedReader(new InputStreamReader(is));
        StringBuilder strBuilder = new StringBuilder();
        String line;
        while ((line = buffer.readLine()) != null) {
            strBuilder.append(line);
        }
        result = strBuilder.toString();
    } catch (Exception e) {
        Log.e(TAG, "http post error", e);
    } finally {
        if (buffer != null) {
            try {
                buffer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (uRLConnection != null) {
            uRLConnection.disconnect();
        }
    }
    return result;
}

private AppVersion parseJson(String json) {
    AppVersion appVersion = new AppVersion();
    try {
        JSONObject obj = new JSONObject(json);
        String updateMessage = obj.getString(AppVersion.APK_UPDATE_CONTENT);
        String apkUrl = obj.getString(AppVersion.APK_DOWNLOAD_URL);
        int apkCode = obj.getInt(AppVersion.APK_VERSION_CODE);
        System.out.println("updateMessage-->" + updateMessage
                + " apkUrl-->>" + apkUrl + "  apkCode-->>" + apkCode);
        appVersion.setApkCode(apkCode);
        appVersion.setApkUrl(apkUrl);
        appVersion.setUpdateMessage(updateMessage);
    } catch (JSONException e) {
        Log.e(TAG, "parse json error", e);
    }
    return appVersion;
}

public void showUpdateDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    // builder.setIcon(R.drawable.icon);
    builder.setTitle("有新版本");
    builder.setMessage(mAppVersion.getUpdateMessage());
    builder.setPositiveButton("下載", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            downLoadApk();
        }
    });
    builder.setNegativeButton("忽略", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {

        }
    });
    builder.show();
}

public void downLoadApk() {
    String apkUrl = mAppVersion.getApkUrl();
    System.out.println("apkUrl-->>" + apkUrl);
    String dir = mContext.getExternalFilesDir("apk").getAbsolutePath();
    File folder = Environment.getExternalStoragePublicDirectory(dir);
    if (folder.exists() && folder.isDirectory()) {
        // do nothing
    } else {
        folder.mkdirs();
    }
    String filename = apkUrl.substring(apkUrl.lastIndexOf("/"),
            apkUrl.length());
    String destinationFilePath = dir + "/" + filename;
    apkFile = new File(destinationFilePath);
    mProgressDialog.show();
    Intent intent = new Intent(mContext, DownloadService.class);
    intent.putExtra("url", apkUrl);
    intent.putExtra("dest", destinationFilePath);
    intent.putExtra("receiver", new DownloadReceiver(new Handler()));
    mContext.startService(intent);
}

private class DownloadReceiver extends ResultReceiver {
    public DownloadReceiver(Handler handler) {
        super(handler);
    }

    @Override
    protected void onReceiveResult(int resultCode, Bundle resultData) {
        super.onReceiveResult(resultCode, resultData);
        if (resultCode == DownloadService.UPDATE_PROGRESS) {
            int progress = resultData.getInt("progress");
            mProgressDialog.setProgress(progress);
            if (progress == 100) {
                mProgressDialog.dismiss();
                // 若是沒有設置SDCard寫權限，或者沒有sdcard,apk文件保存在內存中，須要授予權限才能安裝
                String[] command = { "chmod", "777", apkFile.toString() };
                try {
                    ProcessBuilder builder = new ProcessBuilder(command);
                    builder.start();
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(Uri.fromFile(apkFile),
                            "application/vnd.android.package-archive");
                    mContext.startActivity(intent);
                } catch (Exception e) {

                }
            }
        }
    }
}

} 按 Ctrl+C 複製代碼 MainActivity：

按 Ctrl+C 複製代碼

public class MainActivity extends Activity { UpdateChecker update; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); update = new UpdateChecker(MainActivity.this); findViewById(R.id.btn).setOnClickListener(new OnClickListener() {

@Override
        public void onClick(View v) {
            update.setCheckUrl("http://jcodecraeer.com/update.php");
            update.checkForUpdates();
        }
    });
}

} 按 Ctrl+C 複製代碼

源碼下載：下載